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Sirtfood diet claims to activate the body's natural skinny genes. On the food list are berries, coffee, dark chocolate, kale and red wine. Among those who tried this diet is singer Adele who has already lost 30 pounds.

SIRT1, or popularly known as skinny gene, is associated with improved insulin regulation in the body. SIRT1 is also known as sirtuin activators that can oppose insulin resistance leading to diabetes and obesity.

Skinny genes are activated when there is a shortage of energy in the body after caloric restriction according to Aidan Goggins and Glen Matten, nutrition experts and author of the book "The Sirtfood Diet." In 2015, the two nutritionists looked into 39 participants who followed the Sirtfood diet and lost seven pounds in seven days.

However, Adrienne Youdim, director of the Center for Weight Loss and Nutrition in Beverly Hills, CA, said that the results are speculative. Though the numbers are impressive, the sample size is too small and the duration is too short.

Fruits that are included in the Sirtfood diet are apples, blueberries, oranges and strawberries; while vegetables in the list, aside from kale, are aragula and onion. Kitchen staples also include capers, olives and turmeric.

Sirtfood diet restricts a person to consume only 1,000 calories per day for a week, with three approved smoothis and one meal. On the second week, one can go for 1,500 calories per day, meaning two smoothies and two meals. Onwards, the dieter is expected to stick to sirtuin diet without counting calories, but is also expected to do work outs.

Pete Gercimo, trainer of Adele, said that the singer has already lost 30 pounds following the skinny gene diet according to a report by Shape. Sirtfood diet helps the person burn fat and boost energy, making weight loss a long term success. It also claims to give longer, healthier, disease-free life.